[PATCH] regcache: Do not overwrite error code when finalizing cache after error

[PATCH] regcache: Do not overwrite error code when finalizing cache after error

[Francesco Lavra]

During regcache initialization, if an error occurs in the
cache_ops->populate callback, and if cache operations include an exit
callback, the error code from populate() is overwritten with the return
value from exit(). This hides the error condition from the caller of
regcache_init(), and can cause NULL pointer dereferences when the regcache
is later accessed.

Fixes: 94a3a95f0315 ("regcache: Add ->populate() callback to separate from ->init()")
Signed-off-by: Francesco Lavra <flavra@baylibre.com>
---
 drivers/base/regmap/regcache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 27616b05111c..aa8f2efed779 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -245,7 +245,7 @@ int regcache_init(struct regmap *map, const struct regmap_config *config)
 	if (map->cache_ops->exit) {
 		dev_dbg(map->dev, "Destroying %s cache\n", map->cache_ops->name);
 		map->lock(map->lock_arg);
-		ret = map->cache_ops->exit(map);
+		map->cache_ops->exit(map);
 		map->unlock(map->lock_arg);
 	}
 err_free_reg_defaults:
-- 
2.39.5

Re: [PATCH] regcache: Do not overwrite error code when finalizing cache after error

[Greg Kroah-Hartman]

On Tue, Jun 16, 2026 at 01:44:29PM +0200, Francesco Lavra wrote:
> During regcache initialization, if an error occurs in the
> cache_ops->populate callback, and if cache operations include an exit
> callback, the error code from populate() is overwritten with the return
> value from exit(). This hides the error condition from the caller of
> regcache_init(), and can cause NULL pointer dereferences when the regcache
> is later accessed.
> 
> Fixes: 94a3a95f0315 ("regcache: Add ->populate() callback to separate from ->init()")
> Signed-off-by: Francesco Lavra <flavra@baylibre.com>
> ---
>  drivers/base/regmap/regcache.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
> index 27616b05111c..aa8f2efed779 100644
> --- a/drivers/base/regmap/regcache.c
> +++ b/drivers/base/regmap/regcache.c
> @@ -245,7 +245,7 @@ int regcache_init(struct regmap *map, const struct regmap_config *config)
>  	if (map->cache_ops->exit) {
>  		dev_dbg(map->dev, "Destroying %s cache\n", map->cache_ops->name);
>  		map->lock(map->lock_arg);
> -		ret = map->cache_ops->exit(map);
> +		map->cache_ops->exit(map);
>  		map->unlock(map->lock_arg);
>  	}
>  err_free_reg_defaults:
> -- 
> 2.39.5
> 
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
to these common problems, but in order to save his sanity (he kept
writing the same thing over and over, yet to different people), I was
created.  Hopefully you will not take offence and will fix the problem
in your patch and resubmit it so that it can be accepted into the Linux
kernel tree.

You are receiving this message because of the following common error(s)
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- You have marked a patch with a "Fixes:" tag for a commit that is in an
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If you wish to discuss this problem further, or you have questions about
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thanks,

greg k-h's patch email bot